Using high-speed cameras, MIT researcher Lydia Bourouiba showed that a sneeze creates a turbulent gas cloud able to carry droplets as far as 7 to 8 metres (about 25 feet). Hence the WHO advice: cough or sneeze into your bent elbow or into a tissue you bin straight away, then wash your hands. Sneezing into your palm just means handing your germs to every door handle you touch next.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.